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Instruction
Manual
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STS engine is designed and manufactured for high level of competition
performance. To get the best performance and reliability out
of this engine, you must read these instructions carefully.
Please treat your STS engine with care to ensure the engine
carries long lasting high- performance working time. Several
essential factors must be considered to achieve the optimal
performance of this engine:
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FUEL
This engine should ONLY be used with fuel particular blended for
R/C model car. Never run this motor with gasoline! The choice of
fuel is very important, it should contain a minimum of 10% castor
and/or synthetic oil by volume. Regarding the percentage of nitro:
more nitro content (higher %) will provide more explosive power
from your engine, but it will also shorten the engine's life. For
average use, we recommend 15~25% nitro fuels. |
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GLOW-PLUG
Check your glow-plug regularly. When the glow-wire becomes dull
or mat and the engine stalls without reason, change the glow plug.
A new glow-plug will keep the engine idle stable and optimize its
performance. An old glow- plug is prone to glow-wire broken, melted
or missing. If you keep on using an old grow-plug, you may damage
your engine. Please avoid this situation and check the plug regularly. |
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AIR-FILTER
NEVER run without an air-filter, you will ruin your engine. A good
air-filter is very important to extend the life of your engine.
When you use a foam air-filter, don't forget to impregnate the foam
with air-filter oil before use. You must change your air-filter
regularly. Washed and re-used foam filters may shorten an engine's
life due to the deterioration of the foam element after extensive
use and washing. |
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TUNED PIPE
NEVER run without a pipe, it will cause the engine to over-heat
and will damage your engine. A correctly installed tuned pipe will
let the 2-stroke engine run at peak performance. We recommend that
you choose STS tuned pipes since the STS tuned pipes are developed
with our engines. |
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CARBURETOR TUNING
There are 3 needles on the slide carburetor can be adjusted. When
you are adjusting any one of the needles, each adjustment should
be of the same magnitude and always kept to minimum (use small increments).
Check the engine temperature regularly and keep it under 120 oC
(248 F). ** |
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| High Speed Needle
Adjusts the main flow rate of
the fuel (when the throttle is open significantly). Less fuel
(leaner) will make higher rpm but will also generate a higher
temperature. Tune the main needle to adjust the engine rpm at
high-speed and open-throttle.
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| Be careful of the engine
operating temperature and check it regularly when adjusting this
needle. Lean setting = clockwise turn, more rpm (power) at full
throttle, more heat. Rich setting = counter-clockwise turn, less
full throttle rpm, less heat, more lubrication. No smoke from the
exhaust and high temperatures are indicators that the setting is
too lean and possibly harmful. |
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| Low Speed Needle
Adjust the low-speed fuel flow rate. In general, less low-speed
fuel flow provides your car with more power when you first hit
the throttle. Tune this needle to adjust the low-range reaction.
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| Idle/Air -Screw
Adjusts the airflow when the throttle valve is at idle position.
Less airflow will make the less rpm. Tune the idle/air-screw to
adjust the idle speed. Screw in (clockwise) for a faster idle.
Screw out for a slower idle.
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OPERATING TEMPERATURE
Be careful with the engine operating temperature. You have to measure
the engine temperature regularly. Over-heat the engine will cause
permanent damage to the internal parts of the engine. If you can't
measure temp. make sure smoke is always being generated out the
tuned pipe. Engine operating temperature is depended on air temperature.
There is the suggestion of Engine operating temperature;
Air temp. -5 oC 5-15 oC 15-25
oC 25-35 oC 35 oC -
Engine temp. 60 oC 80 oC 100 oC 120 oC 120+ oC
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FIRST START
If your engine is brand new, the piston and liner is very tight.
It is normal hard to start it up. You can use hairdryer to pre heat
the engine. Or loose the glow plug half turn then try to start the
engine. Once the engine started remember screwing the plug up. |
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YOU
MUST BREAK-IN YOUR ENGINE BEFORE USING!
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BREAK-IN PROCEDURE
1.Install a new conical
type glow-plug (Hotter rated plugs will be better for the rich
settings used during break-in)
2. Use high castor (12% or above)
and low nitro rated glow fuel, 5%~15% nitro is best.
3. First tank of fuel: Start your
engine, idle for 2 minutes with rich air/fuel mixture setting
(some raw fuel is spitting from the exhaust) then stop and let
it cool down. When your engine is stopped, make sure the piston
is NOT at Top Dead Center (TDC) by rotating the flywheel. Let
it cool down and repeat the "start-idle cycle" 6 to
8 times. If idle rpm is too high, adjust the Idle/air-screw. Make
sure the temperature is under 80 oC (176 F) **.
4. Next several tanks of fuel:
run the car on the track at low speed (50% to 80% throttle). Avoid
using a constant throttle position; keep blipping the throttle
to vary the rpm, slow-fast-slow-fast etc. Check the temperature
regularly and keep it between 80 oC (176 F) and 100oC (212 F)**,
if you can not measure temps make sure the engine is running at
heavy smoke from the tuned pipe.
5. When your engine is still being
run-in, higher running temperature is expected. As time goes on,
running temperature will be lowered. At this point you may lean
the engine by turning the main needle clockwise incrementally
and keep the engine running temperature at or below 100oC (212
F) .
6. After about 1~2 liter fuel
through it, take out the glow plug and turn the flywheel by hand,
let the piston pass the top dead center in the sleeve. When you
don't have any significant friction or just a little snug, you
can start leaning the main needle incrementally in small steps,
and keep it around 100~120 oC (212~248 F)** .
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PULL-START SYSTEM
If your engine is equipped with a pull-start system, there is something
you must know before you start it.
Remove the glow plug then draw the line out slowly till the end.
Remember the total length of the line and never over draw out the
line. The pull-start system is very small so it is impossible to
have a long line in it. Never treat it as your lawnmower!
Never draw out the line more than 30cm. When you start your engine
your hand should move between 10cm ~ 30cm speedy. Block the tail
pipe then pull few times, the fuel should be pumped into the carburetor.
Then ignite the glow plug and start the engine. If should be started
after some pulls. If you can't start your engine under some pulls,
you should check your carburetor setting or the plug's ignition
first. |
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AFTER RUN
It is recommended the use of rcengine after run oil to keep internal
moving parts of the engine lubricated. After-run oil helps for an
easy start next time, protects your ball bearings and extends your
engines life. After run oil can be applied via the throttle body
or glow-plug hole. Ensure the areas are absolutely clean before
you remove engine components, enter of debris into the engine is
harmful.
MAINTENANCE
You must treat your engine with care. This high performance STS
Racing engine may work up close to 40,000 rpm. Any failure at
such a high rpm can cause damage and exemplifies why you need
to regularly maintain your STS racing engine. Please understand
that all moving parts inside the engine are subject to wear, and
that if a piston/liner has worn out then likely the end/con-rod
has also worn. When these parts are eventually in need of replacement,
they are readily available and easy to install. If an engine has
been broken, check to see if all of the other moving parts are
still in good shape. If you only replace one part and leave other
worn parts in place, it is possible that you will soon have another
failure.
THESE ARE SOME OTHER IMPORTANT
CONSIDERATIONS
* Clean the outside of the engine before you open it. Any dust
or dirt that enters the engine will cause considerable damage.
* Check the end of the con-rod
frequently. If you want to replace the con-rod, be sure the big
end of the crankshaft pin is not worn out, if not, replace the
crankshaft as well.
* If the engine does not sound
normal and runs loudly, it may be caused by worn bearings. Replacing
the bearings requires the use of a special-tool; ask for service
from your local hobby shop.
* When you start the process of
installing/building your STS engine, each part should be thoroughly
clean prior to installation. Be careful that each part is in its
correct orientation, especially the piston/sleeve/con-rod. The
skirted side of the piston should be facing to the front (carburetor
side). The exhaust port (maxi-port) of the sleeve should be facing
to the rear. The lubricative ditch of con-rod should be facing
to the front of the engine (carburetor side).
* Before you install the head
button, do not forget to install the proper number of head shims.
We suggest that you use at least 0.3 mm head shims. You may need
to adjust the thickness of head shim for best performance. These
are our guidelines.
FUEL Total thickness of head shim
- Under 20% Nitro 0.3 mm
- 25% Nitro 0.4 mm ( +/- 0.1 mm)
- 30% Nitro 0.5 mm ( +/- 0.1 mm)
* Use a high quality hex wrench
to install the screws. When you start to feel resistance, stop
turning the screw. Repeat this for each screw. Use the "Star"
technique to finish tightening the screws of the cooling head.
Do not over-tighten the screws.
**All suggested engine temperature
of this manual is based on 25 oC out door temperature.
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| Any other question
please mail us. |
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